Abstract
Displays based on organic light-emitting diodes (OLEDs) are
now widely used in mobile devices, in which they are major power consumers.
The power drawn by an OLED display increases nonlinearly with sub-pixel
intensities—thus reducing brightness saves appreciable power,
but can displease users. This paper examines this tradeoff, and proposes
a color blending scheme in which each frame is darkened in a way that
reduces power consumption significantly while limiting the visual
impact. The target lightness of frames is determined, in the LAB color
space, from average intensities of the original frames; and these
average values are in turn obtained by adaptive sampling, so as to
reduce the computational overhead. An Android smartphone uses 12%–36%
less power when running this scheme, compared to standard video playback,
while a user evaluation suggested that reducing brightness to a certain
extent can be largely unnoticed, or readily tolerated.
© 2015 IEEE
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